Unexpected autosave traps

I recently set up traps in our 6500s and began receiving messages nightly for the start and finish of the autosave process, but only on one node. I am unsure what is triggering the autosave, possibly a clean-up or standard internal process as it happens daily at a set time. I thought maybe it was the Time of Day sync was triggering it, but the trigger times does not line up with that.

I have tested all the nodes to ensure they are all sending traps and the alarm profiles all appear to be the same across all of them - factory default in which the alarm in question is disabled. - see enclosed pic of alarm profile and trap

Anyone else experienced this or can think of a reason why this might occur?